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A high severity vulnerability in the Linux kernel's xfrm subsystem was resolved. The issue involved improper handling of device references during asynchronous crypto operations, leading to a race condition with device teardown. This could cause use-after-free conditions when the skb->dev pointer is accessed inside NF_HOOK and its okfn. The fix changes when the device reference is released to after the NF_HOOK call, covering multiple packet handling paths.

CVE-2026-31663 addresses a race condition in the Linux kernel's xfrm subsystem related to asynchronous crypto completion. Previously, xfrm_input_resume() called dev_put() immediately upon re-entry before the skb reached transport_finish, causing the skb->dev pointer to be used while racing with device teardown. The patch defers the device reference release until after the NF_HOOK call in transport_finish, using a saved device pointer to safely handle NF_DROP, NF_QUEUE, and NF_STOLEN paths that skip the okfn. For other exit paths and async return points, the reference is released inline when async is set. This prevents use-after-free scenarios and potential kernel crashes or privilege escalations.

Detailed information about UBUNTU-CVE-2026-31663 affecting null linux-azure. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-31663 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux azure: In the Linux kernel, the following vulnerability has been resolved: xfrm: hold dev ref until after transport_finish NF_HOOK After async crypto… (CVE-2026-31663)

CVE-2026-31663 is a vulnerability identified in Microsoft products, specifically versions 2.0 and 3.0. The vulnerability is titled 'xfrm: hold dev ref until after transport_finish NF_HOOK'. No detailed technical description or impact information is provided beyond the title and affected versions. There is no CVSS score available for this vulnerability.

This vulnerability, tracked as CVE-2026-31663, affects Microsoft products version 2.0 and 3.0. The title suggests an issue related to the handling of device references in the context of the transport_finish NF_HOOK within the xfrm subsystem. However, no further technical details or exploitation methods are provided in the available data.

Detailed information about xfrm: hold dev ref until after transport_finish NF_HOOK affecting Microsoft Security Response Center Microsoft. Get real-time updates

xfrm: hold dev ref until after transport_finish NF_HOOK - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-31663 xfrm: hold dev ref until after transport_finish NF_HOOK - VEX

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xfrm: hold dev ref until after transport_finish NF_HOOK


Linux azure: In the Linux kernel, the following vulnerability has been resolved: xfrm: hold dev ref until after transport_finish NF_HOOK After async crypto… (CVE-2026-31663)CVE-2026-31663 0 A high severity vulnerability in the Linux kernel's xfrm subsystem was resolved. The issue involved improper handling of device references during asynchronous crypto operations, leading to a race condition with device teardown. This could cause use-after-free conditions when the skb->dev pointer is accessed inside NF_HOOK and its okfn. The fix changes when the device reference is released to after the NF_HOOK call, covering multiple packet handling paths. HighVulnerability#gcve #osv #ubuntu-cve-2026-31663 Join the discussion	GCVE Database	04/24/2026, 15:16:00 UTC Added: 07/18/2026, 11:21:42 UTC
xfrm: hold dev ref until after transport_finish NF_HOOKCVE-2026-31663 0 CVE-2026-31663 is a vulnerability identified in Microsoft products, specifically versions 2.0 and 3.0. The vulnerability is titled 'xfrm: hold dev ref until after transport_finish NF_HOOK'. No detailed technical description or impact information is provided beyond the title and affected versions. There is no CVSS score available for this vulnerability. MediumVulnerability#gcve #csaf #cve-2026-31663 Join the discussion	GCVE Database	04/02/2026, 00:00:00 UTC Added: 06/29/2026, 22:11:22 UTC

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